Cement-kiln system



Feb.` '7, 1928.

' D. S. JACOBUS CEMENT K ILN SYSTEM Original Filed Aug.l'?, 1916 IN V ENTOR.

A TTORNEYS.

Patented Feb. `7, 1928.

UNITEDV STATES PATENT OFFICE;

DAVID S. JACOBUS, OE JERSEY CITY, NEW JERSEY, ASSIGNOR TO THE BABCOCK &WILCOX COMPANY, OF BAYONNE, NEW JERSEY,`A CORPORATION OF NEW JERSEY.

CEMENT-RIEN SYSTEM.

Original application led August 17, 1916, Serial No. 115,507. Dividedand this application led January 25, 1923.

` My present invention relates to the regulation of the iow of gasesthrough a plurality of cement kilns connected to a common bus ue whichleads, in turn, to a heat-absorbing device, such as a waste heat boiler.

In such systems, as is well understood, the draft drop in each cementkiln is small, so that slight differences in the draft at the gas exitsof two adjacent kilns spaced along the common bus flue will result inlarge differences in the amount of lgases passing through such kilns,and therefore large differences in the operation of the two kilns. Thisdifference is increased obviously as the number of kilns spaced alongthe fiue is increased,

particularly where the gases lead from the.

end'of the common flue to the heat-absorbing device.

The present application is a division of my Patent No. 1,463,363, issuedJuly 31, 1923.

It is one of the objects of my present invention to' overcome thisdificulty. Other objects will appear from the following description of apreferred embodiment, in which Fig. 1 is a plan View, partly in section,showing a portion of a cement kiln system with a waste heat boiler and abus Hue connecting the several kilns to the boiler; Fig. 2 is asectional side elevation of Fig. 1, showing a waste heat boiler andconnections thereto; Fig. 3 is a cross-section on the line III-III ofthe Hue part of Fig'. 2, and Fig. 4 is an enlargeddetail verticalsection of the connection between a kiln stack and the common ue on theline IV--IV of Fig. 1.

Like reference characters indicate like parts in the several views.

In the drawings a plurality of cement kilns 2, 2 are arranged inparallel spaced relation, each of the kilns being fed with cementmaterial through the water cooled spouts 3 (Fig. 3). The upper end ofeach kiln .2 into which the cement-forming material is fed, dischargeswaste gases in the base portion 4 into an individual stack 5, this baseportion having side doors 6 through which the base portion of the stackmay be reached for cleaning.

Over the higher ends of the rotary cement kilns 2 extends a commoniue 7having dustsettling hoppers 8 between the kilns. One

side of this flue is connected to the cement Serial N0. 614,725.

detail in Figs.- 3 and 4. These openings may be controlled by suitableclosure plates or dampers (not shown) movable in slots 11 .(Flg. 4).When the kilns are discharging into the Hue 7 .the damper-s in theseslots are entirely removed and the slots covered by bricks or tiles t;and to regulate the flow of gases from the kilns 2 to the flue 7 andequalize the flow between the various kilns, bricks or tiles may be laidin, as shown at 12. A door '13 (Fig. 4) may be provided for introducingthese bricks or tiles.

' In order to clean the openings 9 between the furnace stacks and theflue, the stacks may be provided with doors 21, opposite the openings 9,and through which bars may be passed for cleaning off any deposit in theopenings. A cleaning device mayv also be brought into this opening forcleaning off `the lower part of the stack. The dust-collecting hoppers 8may be cleaned by cleaning devices inserted through 'the side doors 24.

From the bus flue 7, the gases pass into a heat-absorbing-device, suchas a waste heat boiler 22 of a well-known type, beneath which may bedust-collecting hoppers 8".

vThe gases are drawn through the boiler 22,

preferably at high velocity, by a fan 30 connected to the boiler settingby a iue 29.

l,It will be understood that the connections jfrom the kilns to thecommon bus Hue have a relatively small cross-sectional area for the flowof the gases by which the draft drop at the several kilns may beequalized to a xsufcient extent to secure the desired degree ofuniformity, no matter what the relation of the several kilns to thewaste heat boiler may be. To assist in the equalization, thecross-sectional areas for the flow of the gases may be adjusted once forall, in the illustrative form, by the bricks or tiles 12. These bricksor tiles also provide a certain iiexibility in the adjusting means, sothat the balancing of the draft through the several kilns may beeffected while the kilns are in operation by changing the number oftiles or bricks in each opening 9 through the door 13. In this manner,all possible variations in the operating conditions may be provided forkiln stacks 5 through openings 9, as shown in the bus flue and the wasteheat boiler.

While I have shown my equalizing arrangement in my preferred form, itwill be understood that its embodiment may be widely varied.

I claim:

1. The combination with a plurality of rotary' cement kilns arranged ina substantially parallel series, of. a horizontally extending fluecommon thereto, and draft-producing means connected to the common fluebeyond the series of rotary cement kilns, the connections between thekilns and the common flue being arranged to equalize the theirindividual kilns.

3. The combination with a plurality of rotary cement kilns arranged insubstantially parallel series, of a common Hue extending horizontallyand substantially at right angles to said kilns, connections betyveenthe individual kilns and the common flue arranged .to receive dampersfor closing ofi an individual kiln from said Hue, means associated withsaid connections for regulating the flow of gases through anindividualkiln, and a draft-producing means to create a draft throughthe kilns and the common flue.

4. The combination with a plurality of rotary cement kilns arranged insubstantially parallel series, of a common ue extend- .ing horizontallyand substantiallyy at right angles to said kilns, connections betweenthe individual kilns and the common flue arranged to receive dampers forclosing oil' an individual kiln from said flue, refractories insertablein said connections for regulating the iow of gases through anindividual kiln, and a draft-producing means to create draft through thekilns and the common flue.

DAVID S. JACOBUS.

